21011010320 has 40 divisors (see below), whose sum is σ = 48976251480. Its totient is φ = 8382786560.

The previous prime is 21011010289. The next prime is 21011010389. The reversal of 21011010320 is 2301011012.

It can be written as a sum of positive squares in 4 ways, for example, as 586027264 + 20424983056 = 24208^2 + 142916^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 306461 + ... + 368700.

It is an arithmetic number, because the mean of its divisors is an integer number (1224406287).

Almost surely, 2^21011010320 is an apocalyptic number.

21011010320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21011010320 is an abundant number, since it is smaller than the sum of its proper divisors (27965241160).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21011010320 is a wasteful number, since it uses less digits than its factorization.

21011010320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 675563 (or 675557 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 11.

Adding to 21011010320 its reverse (2301011012), we get a palindrome (23312021332).

The spelling of 21011010320 in words is "twenty-one billion, eleven million, ten thousand, three hundred twenty".